[introduction] the sensor that is based on strain gauge in the choice / when amplifier combination will collect the data such as force, laden, pressure or torque, need remembers a few main consideration factors well. Besides measuring range, the sensitivity that still must consider sensor and amplifier and need drive (power source) voltage.

The sensor that is based on strain gauge in the choice / when amplifier combination will collect the data such as force, laden, pressure or torque, need remembers a few main consideration factors well. Besides measuring range, the sensitivity that still must consider sensor and amplifier and need drive (power source) voltage.

Once you chose appropriate sensor / amplifier is combined and be started and ran DATAQ Instruments data to collect a system, you indicate need and get significant unit (Lbs, psi) . This is the calibration function implementation that use WinDaq data collects the place inside software.

This applied note aims to provide necessary knowledge for you, help you choose appropriate strain gauge sensor / amplifier combination, get accurate, meaningful data.

Sensitivity (gauge pressure coefficient)

Sensitivity, call gauge pressure coefficient sometimes, use at deciding join appoints power source (incentive) voltage brings to bear on the output voltage of the sensor of physical quantity. Will incentive voltage is outputted by the full span that gets sensor with sensitivity (graph 1) .

Graph 1- brings to bear on 10V is incentive, sensitivity is 3mV/V

The output of the biggest full span of sensor is 30mV (10V * 3mV/V) .

Instantaneous outputs voltage and the physical quantity that bring to bear on to become direct ratio. It is with 0-100 Psi pressure sensor exemple, it needs the drive of 10V, sensitivity is 2mV/V. Bring to bear on when 100 Psi, sensor will output 20mV (full span is outputted) , bring to bear on when 50 Psi, sensor will output 10mV (the in part that full span exports) .

Measure range

Like the sensor that is based on strain gauge, amplifier also has sensitivity norms. Below good case, sensor and amplifier will have identical sensitivity, those who make you can use sensor is whole measure range (graph 2) .

Sensitivity of graph 2- computation is compared (R) , sensitivity of R = sensor / amplifier sensitivity = 3/3 = 1.

Measure the full span of probe limits to divide with R, 10, 000 Psi / 1 = 10, 000 Psi.

Because sensor and amplifier have identical sensitivity, because this amplifier can magnify of sensor whole measure range (10, 000 Psi) .

If the amplifier of sensitivity prep above of transducer, criterion transducer will not get making full use of, sensitivity is compared will > 1 (graph 3) .

Sensitivity of graph 3- computation is compared (R) , sensitivity of R = sensor / amplifier sensitivity = 3 / 2 = 1.5.

Measure the full span of sensor limits to divide with R, 10, 000 Psi / 1.5 = 6666.67 Psi.

Because sensor has taller sensitivity, amplifier cannot magnify the whole range of sensor (10, 000 Psi) , measure full span limits to restrict thereby in 6666.67 Psi.

Likewise important is to should remember, although manufacturer may label 2mV/V in the sensitivity of sensor of catalog lieutenant general, but actual sensitivity will label 2.09mV/V or 2.14mV/V in norms watch. To ensure the most accurate measurement, these slight deflection must consider in calibration process (see next tables 1) . To ensure sensor / the full data range that amplifier combination can hold you to try to get, the measure that the likelihood needs to increase sensor (for example, if you want to measure 0-120 Psi, the sensor that chooses to have 0-150 Psi full span to measure range please) .

As above place is shown, when the choice is based on the sensor that is not enlarge strain gauge, be sure to pay close attention please sensitivity. The sensor that is based on strain gauge has 2mV/V or 3mV/V sensitivity, suit amplifier of DATAQ instrument strain gauge very much (DI-8B38-05, DI-8B38-02) .

Calibration

Use watch 1 in full span of computation of 3 of the overview simple measure and base line are worth in order to input WinDaq.

After computational full span and base line are worth, use WinDaq data collects software in inside of buy ” the European Union is installed ” the function will demonstrate significant engineering unit.

Use application give typical examples 1 (express 1) :

Below the case that did not use force in sensor, from ” editor ” next choices in pulling menu ” engineering unit setting “

Maintain inferior n, volt is changeless, be in low n, the input in European Union casing 0 (0)

Be in ” superstratum, volt ” the input in casing 5, be in ” superstratum, european Union ” the input in casing 150

Change European Union label for ” Psi “

Click ” affirmatory “

WinDaq already expanded now indication engineering unit (Psi) .

Conclusion

Should use the sensor that is based on strain gauge / amplifier combination shows and get accurate, meaningful data, must pay close attention the sensitivity of sensor and amplifier and need power supply (incentive) voltage.

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